In the past, available reloading powders allowed the velocity of factory ammunition to be obtained. The age old first step to improving velocity consistency is making sure each case has the same amount of propellant. Best accuracy is achieved by reducing the randomness of these vibrations, and by minimizing shot-to-shot variations in bullet velocity. Do not rely on any scale with a minimum reading/resolution of 0.1 grain if you intend to achieve small variations in muzzle velocity. In most cases higher than factory velocity came with the risk of higher pressure. Here’s our dos and don’ts to ensure that you get the most accurate reading from your reloading scale. of Bullseye alot as a light .357 load and use 11 grs. Overall length of bullet is 0.93". The .308 Winchester is a cartridge accurate enough to notice the slight variations in reloading components. Abstract . Discussion in 'Handloading and Reloading' started by Carphunter, May 13, 2008. Let's look at a couple of shooting examples and vary the muzzle velocity ES and see what it does to the elevation point of impact (POI) strictly because of muzzle velocity variation. … Terms to know. There are a few terms that you need to fully understand here. The most consistent primer available; Premier STS primers reduce shot to shot velocity variations up to 40 percent in reloads Nov 14, 2017. by Reloader from SA. For a medium velocity load in .357 Magnum cases with 158-160 grain bullets at 1.58” OAL use these as minimum start loads and OK to increase a grain or so as needed to get best accuracy. Another way guys come at this is by running 26” or 28” barrels or even longer. I’ve spent the last two editions on velocity variations, and this one will offer some ideas on how to get yours as low as possible. READ MORE. Nov 14, 2017. Bullets, powder, primers and cases … they aren’t all the same, even when they’re from the same lot. Extreme Spread (ES): The difference between the slowest and fastest velocities recorded. As expected, the G7 BC of this bullet is much more constant over the velocity … and a vel. Hi, I have a specific question if somebody knows the answer. Thread Status: Not open for further replies. At the point of maximum movement, slight velocity variations change the muzzle location less; resulting in lower shot dispersion and thus a smaller group size. Reloading Forum (All Calibers) . What this will do for you, is help to Show You your SD / ES. Bullets, powder, primers and cases … they aren't all the same, even when they're from the same lot. BTHP bullet loaded to 2,700 fps with a velocity extreme variation of 50 fps. The .404 Jeffery—one of my favorite big-bore cartridges—was traditionally loaded with a 400-grain bullet to a muzzle velocity of 2,150 fps. If 15 fps is indeed the goal, I wonder if someone could help me trouble shoot things. (1) Velocity versus accuracy The Nosler Reloading Guide data tables are organized in a manner that illustrates the first situation listed above. For years, the subject of “temperature sensitivity” was more about knowing how your handloads would perform in different climatic conditions rather than picking some high tech super powder to allow you to ignore climatic conditions. For an example from my notes: Sierra 190gr .308 MatchKing, in a .308 Win. There are several parameters to be considered, the most obvious of which is comparison of the maximum muzzle velocities (MV) achieved by alternative powders. This is not a no-brainer, because load tables from different sources typically show different results with the same powder. Press J to jump to the feed. Outstanding, Jeff! New Reloading Products for 2020 ... loads closely matched the factory velocity, and group sizes ranged from 1.06 to 1.68 inches. r/reloading: A Subreddit For Reloading! To test whether temperature-induced velocity anomalies are fact or fiction , I loaded 10 rounds each for the 7mm Remington Magnum , a popular long-range hunting cartridge. The .404 Jeffery. Its 2600 fps muzzle velocity becomes 2450 at 100 yards and 1750 at 600 yards (I rounded these numbers). The thing is, you need to "Proof" your loads at a minimum of 300 yards, depending on cartridge you might even go out to 500 yards. With this in mind, ... Velocity (fps) Max Pressure (psi) Titegroup 75 2.7 921 3.0 1,025 21,500 . There are a lot of reloading powders out there, and they all work to make ammo that safely goes bang as long as you do your part. important to remember that equipment variations, different reloading techniques and component variations will most likely yield slightly different ballistics data. If you don’t have a chronograph to measure velocity (you should if you’re reloading! ), then you can find the flat spot on paper. Five tips to reduce shot-to-shot bullet velocity deviation. What kind of velocity variations have folks seen when switching to different brands of the same primer type? For the first example, we'll use a .223 Remington with a 55-grain projectile that has a .240 G1 BC at a nominal muzzle velocity of 3,250 fps. This improvement in velocity consistency is an important benefit to those reloading target loads for practice or competition. This is why uniforming primer pockets is an important step of precision handloading. What I mean is, velocity variation will not really begin to Show Up To The Party until you reach out to about 300 yards. Velocity and pressure readings represent average values obtained under controlled conditions. For example, you’re loading for a 10″ barrel pistol in .223 Remington and are using 52 gr bullets. They can deliver fine short range accuracy but I just cannot get the velocity variation where I want it. This is especially true with today’s powders. I just finished re-doing my 9 Major load since I finished all my Everglades bullets and am switching to Montana Gold. User account menu • Velocity Variation. The values shown may vary substantially with the components and the reloading techniques employed. If we’re working with a horrid 100 fps muzzle velocity change, that means one bullet could lauch at 2550 and the next might hit 2650, in the extreme. Most are due to factors beyond my control. Several are: Variations smaller than the Chronograph can measure, variations in primer performance, variations in the bullet cores, minor variations in barrel conditions shot to shot, etc) The Following are the actual measurements take throughout the process. Today there are powders readily available that allow the reloader to exceed “standard” velocity levels by 100 fps … However, small inconsistencies in ammo due to velocity variation or mixed cases don't affect most recreational or competitive shooters at close range. I use 4.2 grs. For example, assume you are shooting a .223 Rem. Carphunter Member. A standard deviation of 29 fps means you expect two-thirds of the individual velocities to be within 28 fps of the average. So if temperature-induced velocity variation does indeed occur, let's also examine the effect on point of impact at 800 yards — double our typical "long" distance. When shooters talk about muzzle velocity variation they refer to either Extreme Spread (ES) or Standard Deviation (SD). Quickloads generates the following data for a.38-55 using a .378 bullet of 260gr, .93” in length loaded to and overall cartridge length of 2.5", using 20.4 grs. A low SD indicates all our velocities are closer to … It allows for the comparison of the uniformity of velocity between loads in different velocity spectrums; e.g. 1533 from a 30” barrel.jeff. The standard deviation is a number that describes uniformity. Muzzle velocity is the velocity of the bullet measured at 15 feet from the muzzle. One advantage to reloading is the ability to adjust the load ballistics. The concept is simple. Distance determination can be used to show familiarity between shooter and victim, or it could confirm or disprove a suspect’s story. The loads may then be What most shooters don't understand is the harmonic vibration is related to the mass of the bullet. Re: Velocity variation in a tungsten handload by goosepit2007 » Fri Jul 05, 2013 8:06 am could try these loads might help ya to use diferent powder than steel so load is not to dependant on having snug tight fit. 959. Variation in the G1 BC is 8 times the variation of the G7 BC. Dealing With Reloading Component Variations. fo H4227: approximately 17163 psi. The first is Muzzle Velocity (MV). 2. The Evolution can be upgraded as needed to include a bullet feeder, case trimmer (for rifle cartridges only), automated drive, and optional sensors for each critical press function to stop the machine and alert the user in the event of a problem. Standard Deviation (SD): A measure of how spread out a set of numbers are. Press question mark to learn the rest of the keyboard shortcuts. OAL of cartridge is 2.50". A max velocity spread of 27 would indicate "better than average, almost match grade" and you did a good job at the reloading bench. Understanding the issues surrounding reloading component variations is the first step to overcoming them. Our example cartridge for most of these posts has been the popular 6.5 Creemdoor, and Berger Bullets Reloading manual says for that cartridge “Muzzle velocity will increase (or decrease) by approximately 25 fps per inch from a standard 24” barrel.”. Reload data for approaching 357 mag with 12 ga scavenged powder used for reloading. According to his tests, primer seating depth variations can vary firing pin strike energy by as much as 20 percent. We suggest the charge weights shown be reduced initally by 10% to compensate for possible variations from the published data. To test whether temperature-induced velocity anomalies are fact or fiction , I loaded 10 rounds each for the 7mm Remington Magnum , a popular long-range hunting cartridge. To test whether temperature-induced velocity anomalies are fact or fiction , I loaded 10 rounds each for the 7mm Remington Magnum, a popular long-range hunting cartridge. Nov 2, 2017. Is RE-22 powder known for producing variations in velocity readings? The extra 100FPS can make a difference. Reloader from SA. Notice the shape of the 6mm 105 grain Target Hybrid bullet in Figure 1. For my .308 reloads, I end up in the 25 fps range, which is approximately an 8" difference at 1,000. steel powder needs plenty of pressure down on column and to be consistant from shell to shell. A resolution of 0.01 grain should be the norm. You would like some idea of the velocity, … It’s long nose and boat tail make it a better match to the G7 standard. Low velocity spreads or SDs tells you the load has the potential for accuracy but does not guarantee accuracy. High max velocity spreads or SDs guarantees poor accuracy, especially at longer shooting distances. The tables for rifle cartridges show the MVs attained by a maximum charge of several powders, plus velocities yielded by charges 2 and 4 grains below the maximum, for various Nosler bullet weights. Jan 29, 2012. Modern loads bring that muzzle velocity up to 2,350 fps, bringing the .404 Jeffery into the same class as the .416 Rigby and Remington factory loads. In other words, your shots will miss your aim point high or low, depending on the variation in muzzle velocity. A standard deviation of zero means every velocity was the same. Joined: Jan … Most reloading manuals list their loads starting with the fastest powders and work down to the slower powders. The powders have been selected as suitable based in part on the loading density so any of the powders should work well. G. The coefficient of variation is the standard deviation, divided by the mean (average) velocity and then multiplied by 100 and expressed as a percentage. with a 75-gr. 7 Dos and don’ts for electronic reloading scales. I have read on some of the forums that for long range shooting, reloads should have an nominal extreme spread of ~15 fps. ... Winchester’s new StaBALL 6.5 propellant’s burn rate is consistent over extreme temperatures to provide minimum velocity variations and optimal internal ballistics. Glen Zediker. To achieve this, most competition rifle shooters rely upon carefully reloaded ammunition. The smaller the number, the more uniform velocity. Keywords: Gunshot Residue, GSR, Distance Determination, Barrel Length, Bullet Velocity, Revolver, Reloading, Powder Burn Rate . Have you ever wanted to get the velocity for a load that is slightly different than the one published in your reloading manual? So, if temperature-induced velocity variation does indeed occur, let’s also examine the effect on point of impact at 800 yards — double our typical “long” distance. Quantifying Muzzle Velocity Variation: ES & SD. #1. More consistency = better accuracy, theoretically, and probably also in terms of practicality. Home Forums > Ammunition, Gear, and Firearm Help > Handloading and Reloading > 9mm Factory Velocity Variation. The .308 Winchester is a cartridge accurate enough to notice the slight variations in reloading components. Log in sign up. So, if temperature-induced velocity variation does indeed occur, let’s also examine the effect on point of impact at 800 yards — double our typical “long” distance. Precision handloaded ammunition is all about consistency This can cause variations in primer flame intensity, and that can cause variations in propellant ignition that can increase velocity spread. If you have a chrono, you can measure velocity to compare consistency of different loads. 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Rifle shooters rely upon carefully reloaded ammunition, Distance Determination can be used to familiarity.
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